Q19 of 330 Page 11

Write down the formula which relates electric charge, time and electric current.

The equation below shows the relationship between charge, current and time: charge (coulomb, C) = current (ampere, A) × time

Q = I × t

Define the unit of electric current (or Define ampere).

What is an ammeter? How is it connected in a circuit? Draw a diagram to illustrate your answer.

A radio set draws a current of 0.36 A for 15 minutes. Calculate the amount of electric charge that flows through the circuit.

Why should the resistance of :

(a) an ammeter be very small?

(b) a voltmeter be very large?